I can't decide whether their meddling is good or bad.
There is always a risk that says if you allow different formats of vehicle into a race series there will be pro's and con's. You'd think they would get the standards ironed out pre-season rather than making tweaks on a race by race basis, probably in reflection of each race result. Remember in the 90's when the Audi A4 Quattro was inflicted with ballast which made it uncompetitive in the BTCC. All that happened was that Audi pulled out as they couldn't effectively compete.
With the BTCC/WTCC series now being down to so few cars manufacturers, you would think they wouldn't want to upset the marques they have left.